A kind of hot cutting equipment and method of polytetrafluoroethylene sealing ring

Abstract

The present application discloses a heat cutting device and method for polytetrafluoroethylene sealing rings, the heat cutting device comprises a frame, a horizontal cutting assembly, an upper cutting assembly, and a lower cutting assembly, the frame is provided with a positioning piece for positioning the sealing ring to be processed; the horizontal cutting assembly is used to horizontally cut the opening section of the sealing ring to be processed from the outside to the inside, and cut the opening section of the sealing ring to form a horizontal cutting surface, and the horizontal cutting surface divides the opening section into two parts, an upper cutting assembly is used to cut one side of the opening section of the sealing ring to be processed from bottom to top, and the upper cutting assembly stops when cutting at the horizontal cutting surface; the lower cutting assembly is used to cut the other side of the opening section of the sealing ring to be processed from top to bottom, and the lower cutting assembly stops when cutting at the horizontal cutting surface. The present application has the effect of improving the production efficiency of sealing rings.

Description

Technical Field

[0001] The present application relates to the field of sealing ring processing equipment, and in particular to a heat cutting device and method for a polytetrafluoroethylene sealing ring. Background Art

[0002] Polytetrafluoroethylene sealing ring is a plastic product. Compared with rubber, plastic has lower elasticity and higher strength. Plastic can withstand high pressure while rubber cannot. Therefore, in high-pressure dynamic sealing occasions such as automobile air pumps, rubber sealing rings cannot be used as sliding seals, but plastic sealing rings must be used. However, plastic sealing rings have low elasticity, and it is difficult to install a sealing ring without an opening into the groove of the piston. The conventional method is to cut off the annular plastic sealing ring without an opening at one position to form two ends, and then machine matching arm-shaped openings at the two ends of the sealing ring. Finally, the arms are overlapped to form a closed-loop sealing ring. The section where the two arms of the sealing ring overlap is called the opening section of the sealing ring. The shape feature of the arm-shaped opening is that both ends of the sealing ring are reserved with embedded grooves and protruding embedded blocks. The two ends of the disconnected sealing ring are completely closed by overlapping the embedded grooves and the embedded blocks, such as Figure 1 shown.

[0003] In the related art, the processing method of the arm with chip cutting is adopted. The process of processing the arm with chip cutting is complicated. The usual method is to first use a compound turning and milling machine to process one side of the opening, and then turn to the machining center to mill the other side of the opening. The main problem is that the turning and milling method of the arm with chip cutting is slow, and this kind of processing with chip cutting will leave burrs on the arm, and the arm needs to be trimmed, which has low production efficiency. Therefore, there is still room for improvement. Summary of the invention

[0004] In order to improve the production efficiency of polytetrafluoroethylene sealing rings, the present application provides a polytetrafluoroethylene sealing ring hot cutting device and method.

[0005] The present application provides a polytetrafluoroethylene sealing ring heat cutting device and method using the following technical solutions:

[0006] A hot cutting device for polytetrafluoroethylene sealing rings, comprising:

[0007] A frame, wherein the frame is provided with a positioning member for positioning the sealing ring to be processed;

[0008] The horizontal cutting component is used to horizontally cut the opening section of the sealing ring to be processed from the outside to the inside, and cut the opening section of the sealing ring to form a horizontal cutting surface, and the horizontal cutting surface divides the opening section into two parts, an upper part and an lower part;

[0009] An upper cutting assembly is used to cut one side of the opening section of the sealing ring to be processed from bottom to top, and the upper cutting assembly stops cutting when it reaches a horizontal cutting surface;

[0010] The lower cutting component is used to cut the other side of the opening section of the sealing ring to be processed from top to bottom, and the lower cutting component stops when cutting to the horizontal cutting surface.

[0011] By adopting the above technical solution, the positioning member on the frame ensures the stable fixation of the sealing ring to be processed, avoiding deviation during the processing; the horizontal cutting component cuts the opening section horizontally from outside to inside, accurately dividing it into two parts with equal thickness, effectively improving the subsequent processing accuracy; the upper cutting component and the lower cutting component cut the two sides of the opening section from the upper and lower directions respectively. Since the cutting positions of the upper cutting component and the lower cutting component on the opening section of the sealing ring both fall on the horizontal cutting surface formed by the cutting of the horizontal cutting component, the cutting positions of the upper cutting component and the lower cutting component can be accurately docked at the horizontal cutting surface formed by the cutting of the horizontal cutting component, so as to achieve the purpose of disconnecting the annular sealing ring, and forming a lap-arm-shaped opening at both ends of the sealing ring, without additional trimming process, realizing chip-free processing, avoiding the burr problem generated by traditional turning and milling processing, and significantly improving the production efficiency and product quality.

[0012] Preferably, the positioning member includes a positioning seat and a positioning column arranged in the positioning seat. The outer peripheral surface of the positioning column and the inner wall of the positioning seat form a limiting cavity adapted to the sealing ring, and the positioning seat is provided with an inlet opening through which the horizontal cutting component can enter and exit.

[0013] By adopting the above technical solution, the positioning seat and the positioning column cooperate to form a limiting cavity, ensuring the accurate positioning of the sealing ring to be processed during the processing, and avoiding processing errors caused by the deviation of the position of the sealing ring. At the same time, the inlet opening on the positioning seat provides an access channel for the horizontal cutting component, ensuring that the horizontal cutting component can smoothly reach the opening section of the sealing ring for horizontal cutting operation, thereby improving the cutting accuracy and working efficiency.

[0014] Preferably, the positioning seat is provided with air holes at the bottom of the limiting cavity, and the air holes are externally connected to a gas source and are used to blow out the processed sealing ring from the limiting cavity.

[0015] By adopting the above technical solution, the sealing ring can be automatically blown out of the limiting cavity by air flow after processing, avoiding the low efficiency and possible product damage caused by manual material taking, and improving the degree of production automation and working efficiency.

[0016] Preferably, the frame includes a vertical plate, a fixed seat arranged on the front surface of the vertical plate, and a horizontal plate arranged on the back surface of the vertical plate. The positioning member is arranged on the upper surface of the fixed seat, the lower cutting component is arranged on the upper part of the vertical plate, the upper cutting component is arranged on the lower part of the vertical plate, and the fixed seat is provided with an upper cutting through hole through which the upper cutting component can pass upward; the horizontal cutting component is arranged on the back of the vertical plate, and the vertical plate is provided with a horizontal cutting through hole through which the horizontal cutting component can pass horizontally.

[0017] By adopting the above technical solution, the efficient and precise processing of the opening section of the polytetrafluoroethylene sealing ring is achieved. The frame structure is reasonably designed, and the combination of the vertical plate, the fixed seat and the horizontal plate ensures the overall stability of the equipment, and at the same time provides a reasonable layout space for each cutting component. The positioning member is arranged on the upper surface of the fixed seat, which is convenient for the clamping and positioning of the sealing ring to be processed. The lower cutting component is arranged on the upper part of the vertical plate, and the upper cutting component is arranged on the lower part of the vertical plate. Cooperating with the upper cutting through hole on the fixed seat and the flat cutting through hole on the vertical plate, each cutting action can be carried out orderly and without interference. This structural arrangement effectively improves the space utilization rate of the equipment, reduces the interference risk between components, and thus improves the processing efficiency and precision.

[0018] Preferably, the lower cutting component includes a lower cutting slide plate vertically slidably connected to the frame, a lower cutting knife connected to the lower cutting slide plate, and a lower cutting driving member for driving the lower cutting slide plate to slide up and down. An induction component is arranged on the side of the lower cutting slide plate, and a magnetic force component is arranged on the frame. The magnetic force component is located on the traveling path of the induction component and is used to adjust and control the lower cutting stroke of the lower cutting component.

[0019] By adopting the above technical solution, the precise control of the lower cutting stroke of the lower cutting component is achieved. Specifically, the vertical sliding connection between the lower cutting slide plate and the frame, combined with the lower cutting driving member, ensures that the lower cutting knife can stably perform the cutting action. At the same time, an induction component (sensor) and a magnetic force component (magnet) are used to form a non-contact working principle of a proximity switch mechanism (such as a magnetic proximity switch or a Hall effect sensor). When the slide plate moves down and the induction component enters the magnetic field range of the magnet, the sensor triggers a signal, and the control system immediately stops the movement of the slide plate. Through the coordinated action of the induction component and the magnetic force component, the lower cutting stroke can be accurately adjusted within the preset range, avoiding problems such as over-cutting or under-cutting, and thus effectively improving the cutting precision and product quality. This design significantly improves the working reliability and processing efficiency of the equipment.

[0020] Preferably, a pressing plate is arranged at the bottom of the lower cutting slide plate above the positioning member, and an elastic member is arranged between the pressing plate and the lower cutting slide plate. The pressing plate is used to press the sealing ring to be processed.

[0021] By adopting the above technical solution, the pressing plate presses the sealing ring to be processed under the action of the elastic member, avoiding the displacement of the sealing ring during the cutting process, thereby improving the cutting precision and further enhancing the processing stability.

[0022] Preferably, both the pressing plate and the positioning column are provided with lower cutting guide grooves along the traveling direction of the lower cutting knife.

[0023] By adopting the above technical solution, the downward cutting guide grooves formed on the pressing plate and the positioning posts can provide accurate guidance for the movement of the downward cutting knife, ensuring that the downward cutting knife moves along a predetermined trajectory during the cutting process and avoiding cutting deviation. Meanwhile, this structure helps to improve the cutting accuracy, reduce the defective rate of products caused by tool offset, and thus enhance the overall processing quality and efficiency.

[0024] Preferably, a heating component and a temperature detecting component are arranged inside the fixed seat. The heating component is used to heat the area contacted by the seal ring to be processed, and the temperature detecting component is used to keep the temperature of the area contacted by the seal ring to be processed constant.

[0025] By adopting the above technical solution, the heating component can heat the area contacted by the seal ring to be processed, making the material easier to be cut, reducing the resistance during the cutting process, and improving the quality and flatness of the cut. Meanwhile, the temperature detecting component ensures that the temperature of this area remains constant, avoiding material deformation or damage caused by overheating, and guaranteeing the processing accuracy and product quality. Among them, the effect of setting the heating component is to soften the material to optimize the cutting conditions; the effect of setting the temperature detecting component is to stabilize the temperature control environment to prevent changes in material properties.

[0026] A hot cutting method for a polytetrafluoroethylene seal ring, using a hot cutting device for a polytetrafluoroethylene seal ring, includes the following steps:

[0027] S1: Calibrate the cutting knife positions of the upward cutting component, the downward cutting component and the horizontal cutting component, and then fix the seal ring to be processed at the positioning part;

[0028] S2: Start the horizontal cutting component. The horizontal cutting component horizontally cuts the opening section of the seal ring to be processed from the outside to the inside, and forms a horizontal cutting surface on the opening section of the seal ring. The horizontal cutting surface cuts the opening section of the seal ring to be processed into two equal-thickness upper and lower parts;

[0029] S3: Start the upward cutting component and the downward cutting component. The upward cutting component cuts one side of the opening section of the seal ring to be processed from bottom to top, and the cutting knife of the upward cutting component stops after cutting up to the horizontal cutting surface; the downward cutting component cuts the other side of the opening section of the seal ring to be processed from top to bottom, and the cutting knife of the downward cutting component stops after cutting down to the horizontal cutting surface, and the cutting process of the seal ring is completed.

[0030] By adopting the above technical solution, the processing efficiency and quality of the polytetrafluoroethylene sealing ring can be significantly improved. The flat cutting component horizontally cuts the opening section of the sealing ring to be processed from the outside to the inside, forming a horizontal cutting surface and dividing the opening section into two parts with equal thickness, ensuring the consistency of subsequent cutting on both sides, improving the processing accuracy and reducing material waste. The upper cutting component cuts one side of the opening section from bottom to top, and the lower cutting component cuts the other side of the opening section from top to bottom. The cutting depth of both is half of the thickness of the sealing ring, and they are accurately docked at the horizontal cutting surface, avoiding the burr problem generated by the traditional machining method with chips and eliminating the need for additional trimming processes, effectively improving the production efficiency. The entire cutting process is based on the principle of hot cutting without chips, simplifying the process flow, reducing the operation complexity, ensuring the dimensional accuracy of the overlapping arm part, significantly reducing the defective rate, and meeting the high-quality production requirements.

[0031] Preferably, in the tool setting and calibration step of S1, a tool setting standard part is used to calibrate the cutting tools of the upper cutting component, the lower cutting component, and the flat cutting component. Tool setting grooves adapted to the cutting tools of the upper cutting component, the lower cutting component, and the flat cutting component are provided at the tool setting positions of the tool setting standard part. During tool setting calibration, the tool setting standard part is fixed at the positioning part, and then the flat cutting component, the upper cutting component, and the lower cutting component are started successively. When the cutting tools of the flat cutting component, the upper cutting component, and the lower cutting component can pass through the corresponding tool grooves, the tool setting and calibration step is completed.

[0032] By adopting the above technical solution, accurate calibration of the upper cutting component, the lower cutting component, and the flat cutting component is achieved. Through the position matching between the tool setting grooves on the tool setting standard part and each cutting tool, the accuracy and consistency of the cutting tools in the subsequent processing process are ensured, effectively avoiding the increase in the defective rate of products caused by the deviation of the cutting tool positions. At the same time, this method simplifies the tool setting process, improves the equipment debugging efficiency, and further enhances the overall production efficiency and product quality stability. Among them, introducing the tool setting standard part for calibration in the S1 step significantly enhances the cutting tool positioning accuracy, laying a foundation for the subsequent efficient and high-quality hot cutting of the sealing ring.

[0033] In summary, the present application includes at least one of the following beneficial technical effects:

[0034] 1. Through the cooperation of the flat cutting component, the upper cutting component, and the lower cutting component, chip-free machining is realized, avoiding the problem of burr residue in traditional turning and milling machining, reducing subsequent trimming processes, and significantly improving the production efficiency;

[0035] 2. The flat cutting component first cuts the opening section of the sealing ring into two parts with equal thickness, and then the upper cutting component and the lower cutting component respectively cut precisely from both sides to the same horizontal plane, ensuring the height consistency of the overlapping arm structure, effectively improving the dimensional accuracy and reducing the defective rate;

[0036] 3. The overall design of the equipment is compact and reasonable. The coordinated operation of various components simplifies the processing process, greatly shortens the processing time, and solves the problem of slow speed caused by traditional multi-device switching. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a structural schematic diagram of a sealing ring produced by a chip-forming method in the prior art.

[0038] Figure 2 It is a schematic structural diagram of a sealing ring produced by a hot cutting device of a polytetrafluoroethylene sealing ring in an embodiment of the present application using a chip-free processing method.

[0039] Figure 3 It is a plan view of a sealing ring produced by a hot cutting device for a polytetrafluoroethylene sealing ring in an embodiment of the present application using a chipless processing method.

[0040] Figure 4 It is a schematic diagram of the cutting action of a hot cutting device for a polytetrafluoroethylene sealing ring according to an embodiment of the present application.

[0041] Figure 5 It is a schematic diagram of the overall structure of a hot cutting device for a polytetrafluoroethylene sealing ring according to an embodiment of the present application.

[0042] Figure 6 It is a schematic diagram of the main structure of a hot cutting device for a polytetrafluoroethylene sealing ring according to an embodiment of the present application.

[0043] Figure 7 It is a structural schematic diagram of a frame in a hot cutting device for a polytetrafluoroethylene sealing ring according to an embodiment of the present application.

[0044] Figure 8 It is a structural schematic diagram of a positioning member in a hot cutting device for a polytetrafluoroethylene sealing ring according to an embodiment of the present application.

[0045] Figure 9 It is a structural schematic diagram of a lower cutting component in a hot cutting device for a polytetrafluoroethylene sealing ring according to an embodiment of the present application.

[0046] Figure 10 It is a structural schematic diagram of an upper cutting component in a hot cutting device for a polytetrafluoroethylene sealing ring according to an embodiment of the present application.

[0047] Figure 11 It is a structural schematic diagram of a flat cutting component in a hot cutting device for a polytetrafluoroethylene sealing ring according to an embodiment of the present application.

[0048] Figure 12 It is a structural schematic diagram of a lower cutter in a hot cutting device for a polytetrafluoroethylene sealing ring according to an embodiment of the present application.

[0049] Figure 13It is a structural schematic diagram of a tool setting standard part in a hot cutting device for a polytetrafluoroethylene sealing ring according to an embodiment of the present application.

[0050] Description of the accompanying drawings: 1, frame; 11, vertical plate; 111, flat cutting opening; 12, fixed seat; 121, upper cutting opening; 122, guide hole; 123, heating component; 124, insulation strip; 13, horizontal plate; 14, top plate; 15, slide rail; 16, flat cutting guide groove seat; 2, lower cutting component; 21, lower cutting drive member; 22, lower cutting slide plate; 23, lower cutting knife; 24, fixed block; 25, pressure plate; 26, guide column; 27, limit column; 28, Elastic part; 3. Upper cutting assembly; 31. Upper cutting drive member; 32. Upper cutting slide; 33. Upper cutting knife; 4. Horizontal cutting assembly; 41. Horizontal cutting drive member; 42. Horizontal cutting slide; 43. Horizontal cutting knife; 5. Positioning member; 51. Positioning seat; 511. Feeding edge; 512. Limiting cavity; 52. Positioning column; 6. Upper cutting guide groove; 7. Lower cutting guide groove; 8. Induction assembly; 9. Magnetic assembly; 10. Tool setting standard part; 101. Tool setting groove; 102. Threaded hole. DETAILED DESCRIPTION

[0051] The embodiment of the present application discloses a heat cutting device for polytetrafluoroethylene sealing rings, which is used for performing chip-free heat cutting processing on polytetrafluoroethylene sealing rings.

[0052] Figure 1 What is shown is a sealing ring processed by conventional chip processing method. Both ends of the sealing ring are reserved with embedded grooves and protruding embedded blocks, that is, forming an arm-shaped opening. The two ends of the sealing ring are completely closed by embedding and overlapping between the embedded grooves and the embedded blocks. The section where the two arms of the sealing ring overlap is called the opening section of the sealing ring.

[0053] Figures 2 to 4 What is shown is a sealing ring that is processed without chips using the hot cutting equipment for polytetrafluoroethylene sealing rings adopted in this application. The main principle is to stably sleeve the annular sealing ring on the outer periphery of the positioning column 52, and then the flat cutter 43 horizontally cuts the opening section of the sealing ring to be processed from the outside to the inside, and forms a horizontal cutting surface at the opening section of the sealing ring. The horizontal cutting surface cuts the opening section of the sealing ring to be processed into two upper and lower parts of equal thickness. The upper cutter 33 cuts one side of the opening section of the sealing ring to be processed from bottom to top, and the cutting depth of the upper cutter 33 is half of the thickness of the sealing ring, that is, the cutter of the upper cutting component 3 stops after cutting upwards to the horizontal cutting surface. The lower cutting component 2 cuts the other side of the opening section of the sealing ring to be processed from top to bottom, and the cutting depth of the lower cutting component 2 is half of the thickness of the sealing ring, that is, the cutter of the lower cutting component 2 stops after cutting downwards to the horizontal cutting surface. Thus, the sealing ring is cut out as follows. Figure 1 The arm-shaped opening shown.

[0054] ReferenceFigure 5 and Figure 6 Specifically, the hot cutting equipment of the polytetrafluoroethylene sealing ring includes a frame 1, a flat cutting component 4, an upper cutting component 3 and a lower cutting component 2. The frame 1 serves as an overall supporting structure for carrying the remaining components. The flat cutting component 4 is responsible for precise cutting in the horizontal direction. The upper cutting component 3 is mainly used for vertical cutting operations on the bottom of the opening end of the sealing ring, and the lower cutting component 2 is mainly used for vertical cutting operations on the top of the sealing ring. The components work together to effectively cut the opening section of the sealing ring.

[0055] Reference Figure 6 and Figure 7 The frame 1 includes a vertical plate 11 installed vertically on the workbench, a fixed seat 12 fixed horizontally at the front of the vertical plate 11, and a horizontal plate 13 fixed horizontally at the back of the vertical plate 11. Among them, a positioning member 5 is installed on the upper surface of the fixed seat 12 for positioning the sealing ring to be processed, and the positioning member 5 is close to the vertical plate 11. The lower cutting component 2 is arranged on the upper part of the vertical plate, the upper cutting component 3 is arranged on the lower part of the vertical plate 11, and the fixed seat 12 is located between the lower cutting component 2 and the upper cutting component 3. In addition, the fixed seat 12 is provided with an upper cutting opening 121 for the upper cutting component 3 to pass upward. The horizontal cutting component 4 is arranged on the back of the vertical plate 11, and the vertical plate 11 is provided with a horizontal cutting opening 111 for the horizontal cutting component 4 to pass horizontally. Each cutting action can be carried out in an orderly manner without interfering with each other. This structural arrangement effectively improves the space utilization rate of the equipment, reduces the risk of interference between components, and thus improves the processing efficiency and accuracy.

[0056] In this embodiment, the positioning member 5 includes a positioning seat 51 and a positioning column 52 fixed in the positioning seat 51. The outer peripheral surface of the positioning column 52 and the inner wall of the positioning seat 51 form a limiting cavity 512 adapted to the sealing ring. The sealing ring to be processed is set on the outer periphery of the positioning column 52. The positioning seat 51 plays a supporting role for the sealing ring to be processed, ensuring the accurate positioning of the sealing ring to be processed during the processing process, and avoiding processing errors caused by the offset of the sealing ring position. In addition, a side of the positioning seat 51 close to the flat cutting opening 111 is provided with an inlet 511 for the flat cutting component 4 to enter and exit, ensuring that the flat cutting component 4 can smoothly reach the opening section of the sealing ring for horizontal cutting operations.

[0057] Reference Figure 7 and Figure 8 In this embodiment, the positioning seat 51 is provided with a plurality of air holes, which are located at the bottom of the limiting cavity 512 and are spaced apart along the direction of the limiting cavity 512. By connecting the air holes to an external air source, the sealing ring can be automatically blown out of the limiting cavity 512 by air flow after the sealing ring is processed, thereby avoiding the inefficiency and possible product damage caused by manual material removal, and improving the degree of production automation and work efficiency.

[0058] In this embodiment, the fixed seat 12 is internally embedded with a heating component 123 and a temperature detecting component. The heating component 123 is specifically a heating tube, which is arranged around the circumference of the limiting cavity 512. The heating component 123 can also be an electric heating wire or a microwave heating module, and its purpose is to perform local heating and softening treatment on the contact area of the seal ring to be processed, so as to make the subsequent cutting process smoother. The temperature detecting component usually adopts a temperature detecting needle or a temperature detecting system composed of a temperature sensor array, which can monitor the actual temperature value of the contact area of the seal ring to be processed in real time and maintain a constant state within a set range through a negative feedback mechanism, preventing situations such as material deformation and damage caused by overheating. These two components cooperate closely to jointly ensure that the entire cutting link is always under the best working conditions.

[0059] In addition, the fixed seat 12 is embedded with a heat insulation strip 124, and the heat insulation strip 124 is distributed on the outer side of the heating component 123 to block the heat from dissipating to the peripheral part of the fixed seat 12.

[0060] Referring to Figure 7 and Figure 9 , in this embodiment, the down-cutting component 2 includes a down-cutting slide plate 22 vertically slidably connected to the front surface of the vertical plate 11, a down-cutting knife 23 installed on the down-cutting slide plate 22, and a down-cutting driving member 21 for driving the down-cutting slide plate 22 to slide up and down. Among them, the down-cutting slide plate 22 stably slides under the guiding action of the vertical slide rail 15 on the front surface of the vertical plate 11. The top of the vertical plate 11 is installed with a top plate 14 for fixing the down-cutting driving member 21. The down-cutting driving member 21 is specifically a vertically downward electric push rod, and the driving head of the down-cutting driving member 21 is fixed on the surface of the down-cutting slide plate 22, so as to provide power for the up and down sliding of the down-cutting slide plate 22. In addition, the down-cutting slide plate 22 and the down-cutting knife 23 are fixed through a fixing block 24 to improve the stability of the down-cutting knife 23.

[0061] To improve the moving stability of the down-cutting slide plate 22, a plurality of guiding columns 26 are vertically fixed to the bottom of the down-cutting slide plate 22, and the fixed seat 12 is provided with guiding holes 122 matching the guiding columns 26, so that the down-cutting slide plate 22 slides on a vertical line.

[0062] In this embodiment, a pressing plate 25 is installed at the bottom of the down-cutting slide plate 22 and is located directly above the positioning post 52. The pressing plate 25 is used to press the sealing ring to be processed. A groove adapted to the top of the positioning post 52 is recessed at the bottom of the pressing plate 25, so as to be embedded and matched with the top of the positioning post 52 during the downward pressing process, facilitating the downward pressing action of the pressing plate 25. Specifically, the pressing plate 25 is slidably matched with the down-cutting slide plate 22 through a plurality of vertical guide rods. An elastic member 28 is installed between the pressing plate 25 and the down-cutting slide plate 22. The elastic member 28 is specifically a spring, and the spring is sleeved on the outer periphery of the guide rod. When the down-cutting assembly 2 performs down-cutting on the opening section of the sealing ring to be processed, the down-cutting driving member 21 drives the down-cutting slide plate 22 to move downward and drives the pressing plate 25 to move downward. The pressing plate 25 first covers the upper surface of the sealing ring to be processed, and then the down-cutting slide plate 22 continues to move downward. Under the compression action of the elastic member 28, the pressing plate 25 presses the sealing ring to be processed. At this time, the down-cutting knife 23 starts to perform down-cutting on the sealing ring to be processed.

[0063] To improve the stability of the down-cutting knife 23 during the down-cutting process, down-cutting guide grooves 7 are provided on one side of both the pressing plate 25 and the positioning post 52 close to the vertical plate 11 along the traveling direction of the down-cutting knife 23. The down-cutting guide grooves 7 can provide accurate guiding for the traveling of the down-cutting knife 23, ensuring that the down-cutting knife 23 moves along a predetermined trajectory during the cutting process and avoiding cutting deviation. It should be noted that before and after the down-cutting assembly 2 performs down-cutting work, the down-cutting knife 23 is always in the down-cutting guide groove 7 of the pressing plate 25. When the pressing plate 25 presses on the surface of the sealing ring to be processed, the lower end of the down-cutting knife 23 starts to enter the down-cutting guide groove 7 on the surface of the positioning post 52, and the cutting is completed under the guiding action of the down-cutting guide groove 7 throughout the process, thereby improving the cutting accuracy of the down-cutting knife 23.

[0064] In this embodiment, in order to accurately control the cutting depth of the down-cutting assembly 2, an induction assembly 8 is installed on the side of the down-cutting slide plate 22. In addition, a magnetic force assembly 9 is fixed on the front surface of the vertical plate 11. The magnetic force assembly 9 is located on the traveling path of the induction assembly 8 and is used to adjust and control the down-cutting stroke of the down-cutting assembly 2. The non-contact working principle of the proximity switch mechanism composed of the induction assembly 8 (sensor) and the magnetic force assembly 9 (magnet) is adopted (such as a magnetic proximity switch or a Hall effect sensor). When the slide plate moves downward and the induction assembly 8 enters the magnetic field range of the magnet, the sensor triggers a signal, and the control system immediately stops the movement of the slide plate. Through the synergistic effect of the induction assembly 8 and the magnetic force assembly 9, the down-cutting stroke can be accurately adjusted within a preset range, avoiding problems such as over-cutting or under-cutting, thereby effectively improving the cutting accuracy and product quality.

[0065] In addition, a limiting post 27 is vertically fixed to the bottom of the down-cut slide plate 22. When the limiting post 27 abuts against the surface of the fixed seat 12, the cutting depth of the down-cut knife 23 is exactly half of the thickness of the sealing ring. Among them, the limiting post 27 plays a role in forcibly stopping the downward movement of the down-cut slide plate 22, avoiding the situation that the down-cut knife 23 cuts too deeply when the induction component 8 and the magnetic component 9 fail.

[0066] Referring to Figure 10 and Figure 11 , in this embodiment, the up-cut assembly 3 includes an up-cut driving member 31, an up-cut slide plate 32, and an up-cut knife 33. The flat-cut assembly 4 includes a flat-cut driving member 41, a flat-cut slide plate 42, and a flat-cut knife 43. Among them, the structural components and working principles of both the up-cut assembly 3 and the flat-cut assembly 4 are substantially the same as those of the down-cut assembly 2, including components that can accurately control the cutting depth, such as the limiting post 27, the induction component 8, and the magnetic component 9, etc. The main difference lies in the different cutting directions.

[0067] To improve the cutting stability of the up-cut knife 33, up-cut guiding grooves 6 are opened on one side of the positioning seat 51 and the positioning post 52 close to the inlet 511. The top of the up-cut guiding groove 6 of the positioning seat 51 communicates with the inlet 511. The up-cut knife 33 is always in the up-cut guiding groove 6 to improve the cutting accuracy of the up-cut knife 33.

[0068] To improve the cutting stability of the flat-cut knife 43, a flat-cut guiding groove seat 16 is installed at the junction of the up-cut through hole 121 of the fixed seat 12 and the flat-cut through hole 111 of the vertical plate 11. The flat-cut guiding groove seat 16 is integrally T-shaped and slidably cooperates with the fixed block 24 of the flat-cut knife 43, thereby improving the cutting accuracy of the down-cut knife 23.

[0069] In this embodiment, the incision to be processed by the flat-cut knife 43 is a straight line, and the structure of the knife is simple and easy to process. While the incisions to be processed by the up-cut knife 33 and the down-cut knife 23 are curves, the structure of the knife is complex and difficult to process. This case proposes a solution to the processing and fastening structures of the upper knife and the lower knife.

[0070] Taking the down-cut knife 23 as an example, as Figure 12 shown. The two sides of the down-cut knife 23 are set at an angle of 1°. By using wire cutting and then grinding the cutting edge, a cutting knife with the required shape can be obtained. The fixed block 24 of the down-cut knife 23 is also processed by wire cutting to form a tapered hole with a side angle of 1° that fits the down-cut knife 23. Then, with a spacer block for axial positioning and fixed to the fixed block 24, the position of the down-cut knife 23 will be fastened to achieve the effect of not loosening.

[0071] The embodiment of the present application also discloses a hot cutting method for a polytetrafluoroethylene sealing ring. Using a hot cutting device for a polytetrafluoroethylene sealing ring, it includes the following steps:

[0072] S1: Calibrate the cutting tool positions of the upper cutting assembly 3, the lower cutting assembly 2, and the horizontal cutting assembly 4. In the tool alignment and calibration step, use the tool alignment standard part 10 to calibrate the cutting tools of the upper cutting assembly 3, the lower cutting assembly 2, and the horizontal cutting assembly 4. At the tool alignment position of the tool alignment standard part 10, there are tool alignment grooves 101 adapted to the cutting tools of the upper cutting assembly 3, the lower cutting assembly 2, and the horizontal cutting assembly 4. During tool alignment and calibration, fix the tool alignment standard part 10 at the positioning part 5, and then start the horizontal cutting assembly 4, the upper cutting assembly 3, and the lower cutting assembly 2 in sequence. When the cutting tools of the horizontal cutting assembly 4, the upper cutting assembly 3, and the lower cutting assembly 2 can pass through the corresponding tool grooves, the tool alignment and calibration step is completed. Then fasten the cutting tools to ensure the accurate position of the cutting tools without deviation. There are threaded holes 102 on the tool alignment standard part 10, which is convenient for picking and placing operations.

[0073] Use a lathe to turn out the semi-finished seal ring to be processed, and then place the seal ring to be processed in an oven for heating to make the seal ring soft. Then place the softened seal ring to be processed in the limit cavity 512 at the positioning part 5, so as to realize the positioning of the seal ring to be processed. The heating part at the fixed seat 12 heats the contact area of the seal ring to keep a constant temperature.

[0074] S2: Start the horizontal cutting assembly 4. The horizontal cutting tool 43 of the horizontal cutting assembly 4 horizontally cuts the opening section of the seal ring to be processed from the outside to the inside, and forms a horizontal cutting surface on the opening section of the seal ring. The horizontal cutting surface cuts the opening section of the seal ring to be processed into two equal-thickness upper and lower parts.

[0075] S3: Start the upper cutting assembly 3 and the lower cutting assembly 2. The upper cutting tool 33 of the upper cutting assembly 3 cuts one side of the bottom of the opening section of the seal ring to be processed from bottom to top, and the upper cutting tool 33 of the upper cutting assembly 3 stops after cutting up to the horizontal cutting surface. The lower cutting assembly 2 cuts the other side of the opening section of the seal ring to be processed from top to bottom, and the cutting tool of the lower cutting assembly 2 stops after cutting down to the horizontal cutting surface, so as to cut off the annular seal ring at the opening section and form a lap arm opening, and the processing of the seal ring is completed. The upper cutting assembly 3 and the lower cutting assembly 2 can be started in sequence or simultaneously.

[0076] This processing method realizes chip-free processing, no burrs will be generated at the cutting part, and the trimming process is omitted. The cutting surface of the product fits tightly, the sealing effect is good, the processing accuracy required for the fitting surface is reduced, and the product quality is improved. The production defect rate is reduced. And the processing speed of the product is greatly improved, and the production efficiency is enhanced.

[0077] The above are all the preferred embodiments of this application. The protection scope of this application is not limited by this. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A thermal cutting device for polytetrafluoroethylene sealing rings, characterized in that: include: A frame (1), wherein the frame (1) is provided with a positioning member (5) for positioning a sealing ring to be processed; A horizontal cutting component (4) is used to horizontally cut the opening section of the sealing ring to be processed from the outside to the inside, and cut the opening section of the sealing ring to form a horizontal cutting surface, and the horizontal cutting surface divides the opening section into two upper and lower parts; An upper cutting component (3) is used to cut from bottom to top one side of the opening section of the sealing ring to be processed, and the upper cutting component (3) stops cutting when it reaches a horizontal cutting surface; The lower cutting component (2) is used to cut from top to bottom the other side of the opening section of the sealing ring to be processed, and the lower cutting component (2) stops cutting at a horizontal cutting surface.

2. The hot cutting device for polytetrafluoroethylene sealing ring according to claim 1, characterized in that: The positioning member (5) comprises a positioning seat (51) and a positioning column (52) arranged in the positioning seat (51); the outer peripheral surface of the positioning column (52) and the inner wall of the positioning seat (51) form a limiting cavity (512) adapted to the sealing ring; the positioning seat (51) is provided with an entry opening (511) through which the flat cutting component (4) can enter and exit.

3. The hot cutting device for polytetrafluoroethylene sealing ring according to claim 2, characterized in that: The positioning seat (51) is provided with an air hole located at the bottom of the limiting cavity (512); the air hole is connected to an external air source and is used to blow the processed sealing ring out of the limiting cavity (512).

4. The hot cutting device for polytetrafluoroethylene sealing ring according to claim 1, characterized in that: The frame (1) comprises a vertical plate (11), a fixing seat (12) arranged at the front of the vertical plate (11), and a horizontal plate (13) arranged at the back of the vertical plate (11); the positioning member (5) is arranged on the upper surface of the fixing seat (12); the lower cutting component (2) is arranged at the upper part of the vertical plate; the upper cutting component (3) is arranged at the lower part of the vertical plate (11); and the fixing seat (12) is provided with an upper cutting opening (121) through which the upper cutting component (3) can pass upward; the horizontal cutting component (4) is arranged at the back of the vertical plate (11); and the vertical plate (11) is provided with a horizontal cutting opening (111) through which the horizontal cutting component (4) can pass horizontally.

5. The hot cutting device for polytetrafluoroethylene sealing ring according to claim 2, characterized in that: The lower cutting component (2) comprises a lower cutting slide plate (22) vertically slidably connected to the frame (1), a lower cutting knife (23) connected to the lower cutting slide plate (22), and a lower cutting driving member (21) for driving the lower cutting slide plate (22) to slide up and down. The lower cutting slide plate (22) is provided with a sensing component (8) on the side. The frame (1) is provided with a magnetic component (9). The magnetic component (9) is located on the travel path of the sensing component (8) and is used to adjust and control the lower cutting stroke of the lower cutting component (2).

6. The hot cutting device for polytetrafluoroethylene sealing ring according to claim 5, characterized in that: A pressing plate (25) located above the positioning member (5) is provided at the bottom of the lower cutting slide plate (22), an elastic member (28) is provided between the pressing plate (25) and the lower cutting slide plate (22), and the pressing plate (25) is used to press the sealing ring to be processed.

7. The hot cutting device for polytetrafluoroethylene sealing ring according to claim 6, characterized in that: Both the pressing plate (25) and the positioning column (52) are provided with a lower cutting guide groove (7) along the travel direction of the lower cutting knife (23).

8. The hot cutting device for polytetrafluoroethylene sealing ring according to claim 4, characterized in that: A heating component (123) and a heat detection component are arranged in the fixing seat (12); the heating component (123) is used to heat the area contacted by the sealing ring to be processed; and the heat detection component is used to keep the area contacted by the sealing ring to be processed at a constant temperature.

9. A method for hot cutting of a polytetrafluoroethylene sealing ring, using a hot cutting device for a polytetrafluoroethylene sealing ring as claimed in any one of claims 1 to 8, characterized in that: The following steps are involved: S1: calibrating the cutting positions of the upper cutting assembly (3), the lower cutting assembly (2) and the flat cutting assembly (4), and then fixing the sealing ring to be processed at the positioning member (5); S2: starting the horizontal cutting component (4), the horizontal cutting component (4) horizontally cuts the opening section of the sealing ring to be processed from the outside to the inside, and forms a horizontal cutting surface at the opening section of the sealing ring, the horizontal cutting surface cuts the opening section of the sealing ring to be processed into two upper and lower parts with equal thickness; S3: The upper cutting component (3) and the lower cutting component (2) are started, the upper cutting component (3) cuts one side of the opening section of the sealing ring to be processed from bottom to top, and the cutting knife of the upper cutting component (3) stops after cutting upward to the horizontal cutting surface; the lower cutting component (2) cuts the other side of the opening section of the sealing ring to be processed from top to bottom, and the cutting knife of the lower cutting component (2) stops after cutting downward to the horizontal cutting surface, and the sealing ring cutting process is completed.

10. A method for hot cutting a polytetrafluoroethylene sealing ring according to claim 9, characterized in that: In the tool calibration step of S1, a tool calibration standard part (10) is used to calibrate the cutters of the upper cutting component (3), the lower cutting component (2) and the flat cutting component (4). A tool calibration groove (101) matching the cutters of the upper cutting component (3), the lower cutting component (2) and the flat cutting component (4) is provided at the tool calibration position of the tool calibration standard part (10). During the tool calibration, the tool calibration standard part (10) is fixed at the positioning part (5), and then the flat cutting component (4), the upper cutting component (3) and the lower cutting component (2) are started in sequence. When the cutters of the flat cutting component (4), the upper cutting component (3) and the lower cutting component (2) can pass through the corresponding tool grooves, the tool calibration step is completed.

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